Belgian here, never heard of them/the site
They are legit but have a tiny audience, this accident made them instantaneously recognizable.
Good for them, we are all fed up with Politico (Axel Springer) + Euractiv (Mediahuis) duopoly.
P.S. This is just IMO, but De Wever should not have gone to the event, he lost a lot of political capital there. He should have given the ground to Theo Francken and Vansina to do their clown thing and instead he should have traveled 100km to the Florennes airbase to assist at BAFS-2026 that happened at the same time.